Advertisements
Advertisements
Question
What is primary productivity?
Advertisements
Solution
A plant’s primary productivity is the amount of biomass or organic matter produced per unit area over a given time period during photosynthesis. It is expressed in terms of weight (g/m2/yr) or energy (kcal/m2/yr). It is classified into two types: gross primary productivity and net primary productivity. The rate at which organic matter is produced during photosynthesis is known as an ecosystem’s gross primary productivity. Net primary productivity (NPP) is calculated by subtracting respiration losses (R) from gross primary productivity.
RELATED QUESTIONS
What is primary productivity?
How are productivity, gross productivity, net primary productivity and secondary productivity interrelated ?
Why does primary productivity vary in different types of ecosystems?
State the relation between gross and net primary productivity.
What is the primary productivity of an ecosystem and how is it expressed?
Write the relationship between productivity, gross primary productivity, net primary productivity, and secondary productivity.
Secondary productivity is rote of formation of new organic matter by ______.
The biomes energy available for consumption by herbivores is called ______.
Which one of the following ecosystem is most productive in term of net primary production?
How much of the net primary productively of a terrestrial ecosystem is eaten and digested by herbivores?
In the equation GPP − R = NPP R represents ______
Which of the following ecosystems is most productive in terms of net primary production?
Why are oceans least productive?
Why is the rate of assimilation of energy at the herbivore level called secondary productivity?
Primary productivity varies from ecosystem to ecosystem. Explain?
Justify the following statement in terms of ecosystem dynamics. “Nature tends to increase the gross primary productivity, while man tends to increase the net primary productivity”.
Which of the following ecosystems will be more productive in terms of primary productivity? Justify your answer. A young forest, a natural old forest, a shallow polluted lake, alpine meadow.
Use the information provided in the table given below to answer the following questions:
| Tropic level | Net Production(KJm-2y-1) | Respiration (KJm-2y-1) |
| Top Carnivore | 50 | 35 |
| Carnivores | 420 | 378 |
| Herbivores | 4490 | 4041 |
| Producers | 45000 | 40,367 |
- Calculate the gross primary productivity.
- Analyze the trend in the Net Production from Producers to Top Carnivore. Give a reason for your observation.
Which of the following is the unit of productivity of an Ecosystem?
What is the rate at which biomass is synthesised by a trophic level per unit area per unit time called?
What is the relationship between Gross Primary Productivity (GPP) and Net Primary Productivity (NPP)?
In which standard units is productivity measured in terms of mass?
Which organismal category is responsible for producing primary productivity in ecosystems?
Which of the following is a limiting factor for productivity in terrestrial ecosystems?
Which nutrient is essential for enzyme synthesis and chlorophyll production in plants?
Why is CO₂ concentration considered a factor affecting productivity?
Which of the following correctly represents the energy flow in an ecosystem based on productivity concepts?
